1 /* 2 * SPDX-License-Identifier: MIT 3 * 4 * Copyright © 2019 Intel Corporation 5 */ 6 7 #include <drm/drm_file.h> 8 9 #include "i915_drv.h" 10 #include "igt_mmap.h" 11 12 unsigned long igt_mmap_offset(struct drm_i915_private *i915, 13 u64 offset, 14 unsigned long size, 15 unsigned long prot, 16 unsigned long flags) 17 { 18 struct drm_vma_offset_node *node; 19 struct file *file; 20 unsigned long addr; 21 int err; 22 23 /* no need to refcount, we own this object */ 24 drm_vma_offset_lock_lookup(i915->drm.vma_offset_manager); 25 node = drm_vma_offset_exact_lookup_locked(i915->drm.vma_offset_manager, 26 offset / PAGE_SIZE, size / PAGE_SIZE); 27 drm_vma_offset_unlock_lookup(i915->drm.vma_offset_manager); 28 29 if (GEM_WARN_ON(!node)) { 30 pr_info("Failed to lookup %llx\n", offset); 31 return -ENOENT; 32 } 33 34 /* Pretend to open("/dev/dri/card0") */ 35 file = mock_drm_getfile(i915->drm.primary, O_RDWR); 36 if (IS_ERR(file)) 37 return PTR_ERR(file); 38 39 err = drm_vma_node_allow(node, file->private_data); 40 if (err) { 41 addr = err; 42 goto out_file; 43 } 44 45 addr = vm_mmap(file, 0, drm_vma_node_size(node) << PAGE_SHIFT, 46 prot, flags, drm_vma_node_offset_addr(node)); 47 48 drm_vma_node_revoke(node, file->private_data); 49 out_file: 50 fput(file); 51 return addr; 52 } 53